My drawing isn’t perfect but it shows the structure of the igloo which was created by frozen cartons during a winter. The interior of this shelter is big enough to fit 2 adults. How this was created was with the use of the cartons and snow. They shoveled enough space to build the igloo and started with a layer of cartons followed by snow with some ice and let it sit then continued the pattern. Also the way it is structured the entry was is small and as you go in the interior gets larger. To stay warm in this frozen house, people would bring inside a small warmer, where the igloo wont melt.